Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
SHOVEL-DOZER
It is not necessary to prevent the buildup of snow on the tracks, it is better to clean them immediately after a snowfall while the layer is still small, and Neoplatonist, fluffy, and...
A SECOND YOUTH OF A RARITY
Now, when the time for establishment of school of a subclass of car "E", in most circles, the problem of designing and building simple micromachines no longer exists. Thanks to the...